*{
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
  outline: none;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
/* index.css 或 App.css */
.logo {
  height: 32px;
  margin: 16px;
  background: rgba(255, 255, 255, 0.3);
}

